Material models are widely used in finite element codes for analysis of material deformations particularly at high strain rates and elevated temperatures. The problems such as necking and bulging limit the conventional test techniques to measure the stress–strain curves only up to small strains. This is while, in some deformation processes, the strain can be greater than 1. In this work, steel shots of 6 mm in diameter are impacted on specimens at high impact velocities and at elevated temperatures using shot impact test. The geometry of the crater created by a shot impact on the specimen is used for determination of the constants of Zerilli–Armstrong material model. A combined experimental,numerical and optimization approach is used for determination of the constants. With this new technique, stress–strain curves are no longer needed to be obtained by experiment at high strain rates and elevated temperatures.

Over the last decade, evolutionary and meta–heuristic algorithms (EAs) have been extensively used as search and optimization tools in various engineering problems. Honey bees mating optimization (HBMO) algorithm in which the search algorithm is...

this paper peresent an integraithm which covers both effects of personal productivity and financial operations.In this regared we introduce two models. Model NO.1 is allocated for human resources evelution and model NO.2 is allocated for financial...

in this paper we present two methods to sole multi –response statistical problems in these methods we apply the desirability function , genetic algorithm and simulation methodology the desirability function is responsible for modeling the multi...

in this research the application of PSO particle swarm optimization technique is investigated in the automatic calibration of the soil and water assessment tool SWAT the calibrated SWAT model simulated well the daily stream flow of the watershed...

Recent studies on identification of photovoltaic system parameters based on the data available inthe device datasheet lacks accurate results, mainly due to the searching methods which were used, as well assimplifying assumptions which were made. This...